Viscosities of aqueous LiI solutions at 293-525 K and 0.1-40 MPa

The effects of temperature, pressure, and concentration on viscosity of aqueous LiI solutions were determined with a capillary-flow technique and compared with literature data and correlations. The data are interpreted with the extended Jones-Dole equation for strong electrolytes to calculate the viscosity A-, B-, and D-coefficients. Good agreement was found between derived values of the viscosity A- and B-coefficients and the results predicted by Falkenhagen-Dole theory of electrolyte solutions and calculated with the ionic B-coefficient data. It was found that the temperature coefficient, dB/dT> 0, for LiI(aq) is positive (structure-breaking ions). Physical meaning parameters V and E in the absolute-rate theory of viscosity and hydrodynamic molar volume V-k were calculated using present experimental viscosity data. The values of parameter E almost independent on temperature (around 11.1), while the values of parameter V monotonically decreasing as temperature increases. The Arrhenius-Andrade parameters (A and E-a/R) were calculated from measured viscosity data. The predicted capability and validity of the various theoretical models for the viscosity of electrolyte solutions were tested. (C) 2005 Elsevier B.V. All rights reserved.